TalkTalk is raising its prices. Photograph: Graham Turner for the Guardian

TalkTalk customers will pay up to £42 a year more for their broadband and TV packages from May, as the telecoms company announced its second price rise in six months.

The cost of TalkTalk's Plus TV package will increase from £15.50 to £18.50 a month, while its popular Essentials TV package and its low-cost SimplyBroadband deal will each cost £1 a month more, rising to £8.50 and £3.50 respectively. Line rental for all customers will increase by 55p a month to £15.95, after a 45p a month rise in September 2014.

New customers will pay the higher charges immediately, but existing customers will see prices rise on 1 May. From 5 April customers with Plus TV will be given seven Sky channels, including Sky 1 and Sky Sports News, as standard – a move TalkTalk has said justifies its price increase on that package.

"TalkTalk is still the only mainstream ADSL provider to offer a stripped down broadband only package," he said. "Lots of people don't use a landline anymore, so they don't want to pay extra to have inclusive landline calls."

He added that TalkTalk's Essentials package will also still be cheaper than comparable broadband and TV packages from TalkTalk's rivals, with BT offering the closest equivalent package at £15 a month plus line rental.